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HTML

              
                <div class="contributions">
  <div class="spacer"></div>
  <div class="month">jan</div>
  <div class="month">feb</div>
  <div class="month">mar</div>
  <div class="month five-weeks">apr</div>
  <div class="month">may</div>
  <div class="month">jun</div>
  <div class="month five-weeks">jul</div>
  <div class="month">aug</div>
  <div class="month five-weeks">sep</div>
  <div class="month">oct</div>
  <div class="month">nov</div>
  <div class="month five-weeks">dec</div>
  <div class="day">mon</div>
  <div class="day">wed</div>
  <div class="day">fri</div>
  <div class="block"></div>
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</div>
              
            
!

CSS

              
                .contributions
  // Get the pretty stuff out of the way to make it look like GitHub
  text-transform capitalize
  font-family Helvetica
  color #767676
  border 1px solid #d1d5da
  border-radius 3px
  padding 8px
  
  display grid
  grid-template-columns 50px repeat(52, 20px)
  grid-template-rows 30px repeat(7, 20px)
  grid-auto-flow dense
  grid-gap 4px
  
  .spacer
    grid-row 1 / span 2
    grid-column 1
  
  .month
    grid-column-end span 4
    align-self center
    
  .five-weeks
    grid-column-end span 5
    
  .day
    grid-row-end span 2
    grid-column 1
              
            
!

JS

              
                // Create an array to put the colors in
let colors = [];

// Create a bunch of different color arrays, each with different 'weights'
colors.push(Array(10).fill('#eee'));
colors.push(Array(4).fill('#c6e48b'));
colors.push(Array(2).fill('#7bc96f'));
colors.push(Array(2).fill('#239a3b'));
colors.push(Array(1).fill('#196127'));

// Flatten the array
const weightedColors = [].concat.apply([], colors)

// Iterate over all the blocks and assign a random color
document.querySelectorAll('.block').forEach(block => {
  const randomColor = weightedColors[Math.floor(Math.random()*weightedColors.length)];
  block.style.background = randomColor;
});
              
            
!
999px

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